Originally Posted by
Astrophsx
Just depends on the cities you need to travel to. Flights within Spain are usually pretty cheap and quick ~1 hour.
If only it were that simple...your will find in between those cities that direct flights are difficult, and you will nearly always have to fly through Madrid if using Iberia or switch to Vueling and Ryanair.
Trains are an option, but cost about as much as a plane and obviously go slower.